摘要
木工作用透射电子显微术及电子衍射技术研究3种PE(HDPE,LLDPE或LDPE)均聚物高取向薄膜的微结构。定量测定了它们的结晶尺寸。通过倾斜样品电子显微学研究确定了不同种PE纤维结构的对称性。
The microstructures of highly oriented melt-drawn films of high density polyethylene(HDPE), Iinear low density polyethylene (LLDPE) and low densily polyethylene (LDPE)were investigated by transmission electron microscopy(TEM). To facilitate TEM sample preparation and image interpretation the films of PE with alamellar morphology were prepared using the technique of Petermann and Gohil. Sampleswere stabilized against dimensional changes by evaporating a thin layer of carbon ontothe film surface. The melt-drawn films of PE(HDPE,LLDPE or LDPE) consist of highly oriented lamellarstructure,as a result of strain-induced crystallization during preparation of the films. Thelamellar growing direction is perpendicular to the drawing direction. Quantitative thicknessand lateral width of the lamellae were odtained from bright-field images. The averagecrystal size (lamellar thickness and width) of LLDPE or LDPE decreases as compared withthat of HDPE. The electron diffraction tilting study indicated that the film of HDPE formed anasymmetrical fibre structure or a single crystal texture and the films of LLDPE or LDPEconsisted of a syammetrical fibre structure.
出处
《应用化学》
CAS
CSCD
北大核心
1991年第1期46-49,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
中国科学院重大项目资助
关键词
聚乙烯
取向结构
电子显微学
薄膜
polyethylene
oriented structure
electron microscopy
